A graded refractive index metamaterial (MM) exhibits a magnetic dipole designed and demonstrated experimentally for 2.45 GHz operating frequency. The system efficiency of the far-field wireless power transfer technique increased to 32.6% with MM. With 16° reduction in half power beamwidths, 9.78 dBm is received at 1 m with 30 dBm input when MM is placed at an optimum distance of $2.5{\lambda }_0$ from transmitting antenna aperture. The method is studied experimentally, and results are compared with the Friis transmission equation, thus validating experimental and theoretical analysis. The system efficiency is always higher than the system with no MM, and hence the proposed method is suitable for long-range wireless power transfer applications maximizing the theoretical power received.

渐变折射率超材料 (MM) 展示了为 2.45 GHz 工作频率设计和实验证明的磁偶极子。使用 MM，远场无线电力传输技术的系统效率提高到 32.6%。半功率波束宽度减少 16°，当 MM 放置在最佳距离为 30 dBm 时，在 1 m 处接收到 9.78 dBm，输入为 30 dBm$2.5{\lambda }_0$从发射天线孔径。对该方法进行了实验研究，并将结果与​​弗里斯传输方程进行了比较，从而验证了实验和理论分析。系统效率始终高于没有 MM 的系统，因此所提出的方法适用于最大化接收理论功率的远程无线电力传输应用。